North Korea’s making a lot of threats these days. How worried should we be?

TOKYO — North Korea’s doing a lot of saber-rattling these days. It has been threatening to launch a preemptive nuclear strike one day and ignite South Korea into a "sea of flames" with multiple rocket launchers the next. “The DPRK's army will reduce all bases and strongholds of the U.S. and south Korean warmongers for provocation […]